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|
package game
import (
"fmt"
"log"
"golang.org/x/exp/slices"
)
type eventType int
const (
destruction eventType = iota
eot
sacrifice
play
target
etb
)
var EventTypes = struct {
Destruction eventType
Eot eventType
Sacrifice eventType
Play eventType
Target eventType
Etb eventType
}{
Destruction: destruction,
Eot: eot,
Sacrifice: sacrifice,
Play: play,
Target: target,
Etb: etb,
}
func (e eventType) String() string {
switch e {
case destruction:
return "destruction"
case eot:
return "eot"
case sacrifice:
return "sacrifice"
case play:
return "play"
case target:
return "target"
case etb:
return "etb"
}
log.Panicf("Unknown evenType: %d", e)
return ""
}
type Event struct {
eventType eventType
sources []interface{}
affected []interface{}
}
func (e Event) String() string {
if len(e.sources) == 0 {
return e.eventType.String()
}
return fmt.Sprintf("%v:%v", e.sources, e.eventType)
}
func newEotEvent() Event {
return Event{eventType: eot}
}
func newTargetEvent(source interface{}, targets *Targets) Event {
affected := make([]interface{}, 0, len(targets.ts))
for _, t := range targets.ts {
affected = append(affected, t.sel...)
}
return Event{eventType: target, sources: []interface{}{source}, affected: affected}
}
type Trigger interface {
Source() interface{}
String() string
Card() *Card
trigger(*LocalState, Event) ([]*TriggeredAction, bool)
}
type triggerBase struct {
source interface{}
condition func(*LocalState, Event) (bool, bool)
resolveFunc ActionResolveFunc
costFunc ActionCostFunc
desc string
}
func (t *triggerBase) Source() interface{} { return t.source }
func (t *triggerBase) String() string { return t.desc }
func (t *triggerBase) Card() *Card {
switch t := t.source.(type) {
case *Card:
return t
case Permanent:
return t.Card()
default:
log.Panicf("Unhandled source type %v", t)
return nil
}
}
func (t *triggerBase) trigger(s *LocalState, e Event) ([]*TriggeredAction, bool) {
triggered, remove := t.condition(s, e)
if !triggered {
return nil, remove
}
return []*TriggeredAction{newTriggeredAction(e, t, t.resolveFunc, t.costFunc)}, remove
}
func newTargetedTrigger(p Permanent, singleshot bool, resolveFunc ActionResolveFunc, desc string) Trigger {
t := triggerBase{source: p, resolveFunc: resolveFunc, desc: desc}
t.condition = func(_ *LocalState, event Event) (bool, bool) {
c := event.eventType == EventTypes.Target &&
slices.Contains(event.affected, p.(interface{}))
remove := singleshot && c
return c, remove
}
return &t
}
func newDeathTrigger(p Permanent, singleshot bool, resolveFunc ActionResolveFunc, permCond func(Permanent) bool, desc string) Trigger {
t := triggerBase{source: p, resolveFunc: resolveFunc, desc: desc}
t.condition = func(_ *LocalState, event Event) (bool, bool) {
if !(event.eventType == EventTypes.Sacrifice || event.eventType == EventTypes.Destruction) {
return false, false
}
destroyedPerm := event.affected[0].(Permanent)
c := permCond(destroyedPerm)
remove := singleshot && c
return c, remove
}
return &t
}
func newOwnDeathTrigger(p Permanent, resolveFunc ActionResolveFunc, desc string) Trigger {
return newDeathTrigger(p, true, resolveFunc, func(destroyedPerm Permanent) bool {
return p == destroyedPerm
}, desc)
}
func newEnemyDeathTrigger(p Permanent, resolveFunc ActionResolveFunc, desc string) Trigger {
return newDeathTrigger(p, true, resolveFunc, func(destroyedPerm Permanent) bool {
return p.Controller().IsEnemy(destroyedPerm.Controller())
}, desc)
}
|
